Tired Physics Professor

%% Tired Physics Professor Reading Fine Print
% Determines the best focal length of lens

% Input and Variables
d = input('Distance from glasswear\n');
v = input('Ideal distance from glasswear\n');

% Outputs and Equations
f = 1/v-1/d;
f = 1/f;
fprintf('The focal point should be: %.3e m', f);